Shafts of 75 :t 0.2 mm diameter are to be checked with the help of go and not-go snap gauge. Determine the go and not-go gauge dimensions in unilateral and bilateral system. Consider normal wear allowance and gaugemaker's tolerance.

The problem involves determining the dimensions of go and not-go gauges for shafts of 75 ± 0.2 mm diameter. The gauges are used to check whether the shafts are within the specified tolerance range.

1. Unilateral System: In this system, all the tolerance is in one direction from the basic size.

   • Go Gauge: The go gauge checks the maximum material limit. So, it should be equal to the lower limit of the shaft diameter. Therefore, Go gauge diameter = 75 - 0.2 = 74.8 mm.

   • Not-Go Gauge: The not-go gauge checks the minimum material limit. So, it should be equal to the upper limit of the shaft diameter. Therefore, Not-Go gauge diameter = 75 + 0.2 = 75.2 mm.

2. Bilateral System: In this system, the tolerance is equally distributed in both directions from the basic size.

   • Go Gauge: The go gauge checks the maximum material limit. So, it should be equal to the basic size minus half the tolerance. Therefore, Go gauge diameter = 75 - 0.1 = 74.9 mm.

   • Not-Go Gauge: The not-go gauge checks the minimum material limit. So, it should be equal to the basic size plus half the tolerance. Therefore, Not-Go gauge diameter = 75 + 0.1 = 75.1 mm.

Note: The above calculations do not consider the normal wear allowance and gaugemaker's tolerance. These values are usually provided by the gauge manufacturer and should be subtracted from the go gauge size and added to the not-go gauge size. Without these specific values, we cannot provide the final gauge dimensions.